| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 743367 | Sensors and Actuators B: Chemical | 2012 | 7 Pages |
Abstract
A polyvinyl alcohol (PVA) coated photonic crystal optical fiber (PCF) sensor has been proposed as a relative humidity (RH) sensor. It was fabricated by collapsing the holes of PCF at both ends to form a Michelson interferometer with cladding mode excitation. PVA was dip coated onto the sensor and the interference shift was measured when the sensor was exposed to varying RH. The sensor with 9% (w/w) coating showed a high sensitivity of 0.60 nm/%RH, displayed little hysteresis, high repeatability, low cross-sensitivity to temperature and ammonia gas and stability over 7 days of testing. A rise/fall time of 300/500 ms was achieved respectively.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Wei Chang Wong, Chi Chiu Chan, Li Han Chen, Tao Li, Kok Xian Lee, Kam Chew Leong,